1-{2,4-Di-(2-hydroxyethoxy)phenyl}-2-(2-thienyl)ethene (5) was prepared and condensed with terephthaloyl chloride to yield polyester (6). Polymer 6 was reacted with tetracyanoethylene to give novel Y-type polyester (7) containing 1-(2,4-dioxyethoxy)phenyl-2-{5-(2,2,3-tricyanovinyl)-2-thienyl)}ethenyl groups as NLO-chromophores, which are parts the polymer backbones. Polymer 7 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It showed thermal stability up to 300℃ in thermogravimetric analysis with glasstransition temperature obtained from differential scanning calorimetry near 134℃. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at the 1560 nm fundamental wavelength was around 6.74 x 10-9 esu. The dipole alignment exhibited high thermal stability up to the glass-transition temperature (Tg), and there was no SHG decay below 135 oC because of the partial main-chain character of polymer structure, which is acceptable for NLO device applications.

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